how does the computer decide timing.

[PorkChopExpress]

just an example.

i set the timing: 4400 rpm wot 27 dbtdc

what the computer does 4400 rpm 4 dbtdc.

i dont hear any knock, even if it did the knock map is 8 deg.

[Darius]

What are you talking about? What are you tuning with?

[DrifterProdigy85]

Computer should decide timing off of RPM, Load, and MAF Voltage.

[PorkChopExpress]

im using nistune. the computer will not follow the timing map wot.

[Joe]

is this while free revving or under load?

[PorkChopExpress]

i believe this is 4th gear.

[Carl H]

is the software up to date?there is a huge difference in power with 27* and 4*...4* will not go anywhere.

[PorkChopExpress]

ya its up to date. it did this to me even with the stock map. i double checked to load the address from the ecu.

[PorkChopExpress]

this is very annoying, if anyone has any ideas, please shout them out. only idea i have would be a faulty ecu.

[jey_253]

Are you going off the reading of the guages on nistune or have you checked the actual timing with a timing light free revving?

[Carl H]

i think its a glitch in nistune...i know with a consult cable my timing follows the map that i set within the ecu.

[PorkChopExpress]

no i can feel it pulling the timing. anything above 50% throttle i can hear the exhaust note get loud, builds boost but goes nowhere.

doesnt seem to happen all the time. sometimes it feels like its pulling harder then others.

[Carl H]

coolant temps have alot to do with the timing...if it ever gets over 100*c it will start pulling timing.post up the timing map you are running and perhaps we can figure out why its not running right.

[PorkChopExpress]

the above picture is the current timing grid im using. coolant temp 80c.never gets above 85c.

[johnzm]

the above picture is the current timing grid im using. coolant temp 80c.never gets above 85c.

if your physically feeling it pull timing out, you need to try a stock ecu and se if it does the same thing. if it does you need to take a look at the car.

if not, load a factory map up into nistune. start your car and let it get to a steady idel (750rpm) turn on your software and check the timning with a light. does your timing match the # in nistune? if not mess with the cam angle sensor until it does.

once it does take it out for a spin see if it still pulls timing. if so i would disable the knock maps (i did on mine)

and take it for another spin.

if its still pulling timing i have a feeling i would want to put it on a dyno and verify its pulling timing while doing a pull through the rpm.

hit up nistune forums too theres alot of stuff that decides the final timing # and u need to check it all

[Blown240sx]

Well from my prior experience I have never reached those areas in my maps when tuning unless the car is under heavy load.

You should only be at like load 48 or so at that RPM. Might check the MAF. Do you have a different MAF on the car? Check your MAF settings for NISTUNE.

Also you shouldn't run so much ignition timing that high in the RPM band even with low load. I run like 45 around normal driving and 20-30s in the idle low throttle areas but dip it down to the 30s or lower at high throttle no matter what load. High rpm you don't have much room for error.

[johnzm]

Well from my prior experience I have never reached those areas in my maps when tuning unless the car is under heavy load.

You should only be at like load 48 or so at that RPM. Might check the MAF. Do you have a different MAF on the car? Check your MAF settings for NISTUNE.

Also you shouldn't run so much ignition timing that high in the RPM band even with low load. I run like 45 around normal driving and 20-30s in the idle low throttle areas but dip it down to the 30s or lower at high throttle no matter what load. High rpm you don't have much room for error.

i neglected to see that and i agree that you shoudlnt ever be near the end of the map, especially at that rpm.

[PorkChopExpress]

stock maf and leak tested. here is another pick of the log with the maf (pink) line if that helps.

[Carl H]

can you post up an actual map trace...its very hard to read a graph.

[l0nestar]

can you post up an actual map trace...its very hard to read a graph.

Also, don't compress the image when uploading to Photobucket. Leave it 'as is' or set it to 1MB size. Easier to read - no squinting involved

[Blown240sx]

What strikes me as odd at the point you have selected on the datalog graphing area it says MAF voltage 4.3 but its maxed on your load/rpm maps. I thought max load on the MAF was 5.3 volts?

[jey_253]

Dont know if this is still case but when i was using nistune i had to set knock map and high octane map to same number so that it would actually adjust timing